That's a great idea for a tournament - it always adds some excitement! From my own experience, I can say that the software really helps you adapt quickly. I’ve personally tested the mods on SMG Cheats
https://smgcheats.com/catalog/eft-arena - and I can assure you they work great: the ballistics calculations hit the target precisely, even when your opponent is actively maneuvering. Another real treat is the clear indicators for distance and enemy weapons. As for the duration, I recommend starting with a one-day pass so you can find a comfortable legit setup and avoid drawing attention with unnecessary pre-fires. And how many teams are participating in your tournament overall?